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Full text of "Monthly performance report : Montecito Pines"

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SOLAR/1045-78/12 



Monthly 

Performance 

Report 



MONTECITO PINES 
DECEMBER 1978 



U.S. Department of Energy 




National Solar Heating and 
Cooling Demonstration Program 

National Solar Data Program 



NOTICE 

This report was prepared as an account of work sponsored by the United States 
Government. Neither the United States nor the United States Department of Energy, nor 
any of their employees, nor any of their contractors, subcontractors, or their employees, 
make any warranty, express or implied, or assume any legal liability or responsibility for 
the accuracy, completeness or usefulness of any information, apparatus, product or 
process disclosed, or represents that its use would not infringe privately owned rights. 



MONTHLY PERFORMANCE REPORT 
MONTECITO PINES 
DECEMBER 1978 

I. SYSTEM DESCRIPTION 

The Montecito Pines site is an apartment complex in Santa Rosa, California. 
It consists of one instrumented unit containing eight apartments. Each 
apartment has approximately 864 square feet of conditioned space. Solar 
energy is used for space heating and preheating domestic hot water (DHW). The 
solar energy system which serves the 8-apartment unit has an array of flat- 
plate collectors with a gross area of 950 square feet. The array faces 22 
degrees west of south at an angle of 45 degrees to the horizontal. Water is 
the transfer medium that delivers solar energy from the collector array to 
storage and to the space heating and hot water loads. Freeze protection is 
provided by drain down. Solar energy is stored underground in a 2000-gallon 
insulated tank. City water is circulated through a heat exchanger in the 
storage tank for preheating before entering a gas-fired boiler which supplies 
DHW on demand. When solar energy is insufficient to satisfy the space heating 
load, the gas-fired boiler provides auxiliary energy for space heating. The 
system, shown schematically in Figure 1, has four modes of solar operation. 

Mode 1 - Collector-to-Storage : This mode activates when the collector plate 
temperature exceeds the storage temperature by 17°F and terminates when a 
temperature difference of 3°F is reached. Collector loop pump PI is operating. 

Mode 2 - Storage-to-Space Heating : This mode activates when there is a space 
heating demand and the temperature at the top of the storage tank is 105°F or 
higher. Space heating pump P2 is operating and mode diversion valves VI and 
V2 divert the flow to the heat exchanger in the storage tank and bypass the 
gas-fired boiler. 

Mode 3 - Auxiliary Space Heating, DHW Preheating : This mode activates when 
there is a space heating demand and the temperature at the top of the storage 
tank is less than 105°F. Space heating pump P2 is operating and mode diversion 
valves VI and V2 direct the flow through the gas-fired boiler and bypass the 
heat exchanger in the storage tank. 

Mode 4 - DHW Preheating : This mode activates when there is a demand for DHW. 
Incoming city water passes through the heat exchanger in the storage tank on 
the way to the gas-fired boiler which supplies hot water, on demand, to the 
apartments. 

II. PERFORMANCE EVALUATION 



INTRODUCTION 

The solar energy system operated continuously during December. Average 
daily solar radiation was well above the long-term December average while 



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average ambient temperature was well below the long-term average for December. 
Storage average temperature declined gradually during the month of December 
and the storage average temperature for December was four degrees less than 
the November monthly average. Approximately equal amounts of solar energy 
were applied to the DHW and space heating loads in December with the result 
that solar energy satisfied a significant portion of the DHW load and a small 
portion of the space heating load. 

WEATHER CONDITIONS 

During the month, total incident solar energy on the collector array was 34.9 
million Btu for a daily average of 1186 Btu per square foot. This was above 
the estimated average daily solar radiation for this geographical area 
during December of 928 Btu per square foot for a plane facing 22 degrees west 
of south with a tilt of 45 degrees to the horizontal. The average ambient 
temperature during December was 41 °F as compared with the long-term average 
for December of 48°F. 



THERMAL PERFORMANCE 

Collector - The total incident solar radiation on the collector array for the 
month of December was 34.9 million Btu. During the period the collector loop 
was operating, the total insolation amounted to 31.4 million Btu. The total 
collected solar energy for the month of December was 9.8 million Btu, result- 
ing in a collector array efficiency of 28 percent, based on total incident 
insolation. Solar energy delivered from the collector array to storage was 

8.4 million Btu. Energy loss during transfer from the collector array to 
storage was 1.4 million Btu. This loss represented 14 percent of the energy 
collected. Operating energy required by the collector loop was 0.56 million 
Btu. 

Storage - Solar energy delivered to storage was 8.4 million Btu. There were 

6.5 million Btu delivered from storage to the DHW and space heating subsystems. 
Energy loss from storage was 1.7 million Btu. This loss represented 20 per- 
cent of the energy delivered to storage. The storage efficiency was 80 
percent: This is calculated as the ratio of the sum of the energy removed 
from storage and the change in stored energy, to the energy delivered to 
storage. The average storage temperature for the month was 102°F. 

DHW Load - The DHW subsystem consumed 2.6 million Btu of solar energy and 4.3 
million Btu of auxiliary thermal energy (equivalent to 5.4 million Btu auxiliary 
fossil fuel energy) to satisfy a hot water load of 6.0 million Btu. The 
solar fraction of this load was 43 percent. The DHW subsystem consumed a 
total of 0.70 million Btu of operating energy, none of which was chargeable 
to the solar energy system. A daily average of 322 gallons of DHW was con- 
sumed at an average temperature of 134°F delivered from the tank. 

Space Heating Load - The space heating subsystem consumed 2.5 million Btu of 
solar energy and 37.6 million Btu of auxiliary thermal energy (equivalent to 
47.0 million Btu auxiliary fossil fuel energy) to satisfy a space heating 



load of 30.0 million Btu. The solar fraction of this load was 8 percent. 
Losses from the space heating subsystem were 10.1 million Btu. The space 
heating subsystem consumed a total of 2.2 million Btu of operating energy, 
none of which was chargeable to the solar energy system. 



OBSERVATIONS 

Extreme stability has masked the performance of the solar energy system over 
the past two months. Operational incident solar energy has averaged 90 
percent of total incident solar energy; solar conversion efficiency has 
averaged 14 percent and collector efficiency has averaged 28 percent. Month- 
to-month variation for these parameters is less than 1 percent. Losses 
between the collector array and storage declined from 17 percent in November 
to 14 percent in December. This rate of loss is on the high side but is not 
unreasonable. 

Approximately 5.0 million Btu of solar energy were applied to the DHW and 
space heating loads in both November and December. The allocation between 
loads was significantly different however: In November, two-thirds of the 
solar energy was applied to the space heating load and one-third to the DHW 
load; in December, approximately equal amounts of solar energy were applied 
to the DHW and space heating loads. The governing factor in the division of 
solar energy between the DHW and space heating loads in this system is the 
storage tank temperature. Assuming a demand for both DHW and space heating, 
increasing amounts of available solar energy will be applied to the DHW load 
as the storage tank temperature declines. 



ENERGY SAVINGS 

The solar energy system provided a total fossil fuel energy savings of 8.5 
million Btu at an expense of 0.56 million Btu of electrical energy. The DHW 
subsystem provided a fossil fuel energy savings of 4.4 million Btu. The 

space heating subsystem contributed a fossil fuel energy savings of 4.2 
million Btu. 



III. ACTION STATUS 

Sensor problems exist in the DHW recirculation loop and with the gas usage 
totalizer. A site visit by IBM and Boeing has been scheduled for January. 



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UNIVERSITY OF FLORIDA 

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